The standard focuses specifically on (Group 1 or 2) used in refining equipment such as pressure vessels, heat exchangers, piping, and pump cases.
NACE RP0472 addresses the following welding processes:
To prevent cracking, the standard dictates strict control over chemistry, welding procedures, and post-weld treatments to ensure hardness stays below critical thresholds. 1. Maximum Hardness Limits
: The primary method for ensuring resistance to environmental cracking is limiting the hardness of the weldment. The standard typically mandates a maximum hardness of (Brinell) or equivalent for carbon steel. Weld Procedure Qualification
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PWHT involves heating the completed weldment to a stress-relieving temperature (typically between 595°C to 650°C / 1100°F to 1200°F) and holding it for a specified duration.